Automatic shut-off valve.



W. BRENNAN. AUTOMATIC SHUT-OFF VALVE.

APPLIOATION FILED AUG. 16, 1909.

WITNESSES:

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Patented Apr.26, 1910.

2 BHBBTSSHEET 1.

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A T'TORNEY.

W. BRENNAN.

AUTOMATIC SHUT-OFF VALVE.

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955,844, Patented Apr. 26,1910.

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WILLIAM BRENNAN, 0F LOWELL, MASSACHUSETTS.-

AUTOMATIG SHUT-OFF VALVE.

Specification of Letters Patent.

Application filed August 16, 1909.

Patented Apr. 26, 1910.

Serial No. 513,152.

T 0 all whom it may concern:

Be it known that I, l/VILLIAM BRENNAN, a citizen of the United States,residing at Lowell, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inAutomatic Shut-Off Valves, of which the following is a specification.

My invention relates to automatic shut off valves or cocks for burnersof illuminating gas.

The purpose of my invention is to stop the flow of gas when the cock isopened and the gas is not lighted; as for instance, when the gas flameis blown out. My device will also close the gas cock, if it isaccidentally turned on or if it is turned on and the gas is not lightedfrom any cause.

The special advantages of my invention are that when the gas is turnedon and lighted, the cock will be closed a very little distance by aclock work mechanism, and will then be stopped by a thermostat actuatedby the heat of the flame. If the flame is blown out, the thermostatcontracts and allows the clock work mechanism to entirely close thecock, thus shutting off the gas after several minutes.

With my device, itis not necessary to hold the cock open with the handuntil the thermostat is heated. Moreover the cock can be turned off byhand, or can be turned part way off so as to turn the gas flame down,without affecting the mechanism. WVhen the gas flame is so turned down,the thermostat still keeps the cock from closing, until the flame ceasesto burn.

The operation of my device is as follows. The turning of the gas cockthe usual one quarter turn winds a main spring which is connected withan escapement. This escapement prevents the main spring from closing thecock instantly, but allowsit to be closed in the course of severalminutes. Meantime, however, if it is lighted, the gas heats a thermostatwhich expands and comes in contact with a brake wheel attached to theclock work system, thereby stopping the clock work. If the gas is notlighted, the cock will be closed after a few minutes. When the gas isturned on and lighted, the cock begins to close, but before it is closedto any appreciable extent, the thermostat operates as a brake and holdsthe cock in the open osition. When the flame ceases to burn from anycause, the thermostat contracts and releases the brake wheel, where--upon the clock work again begins to operate and gradually closes thecock, thus shutting off the gas.

In the drawings Figure 1 is a side View of my device attached to a gasburner. Fig. 2 is a front viewthereof. Fig. 3 is a side -view with theside casing plate removed.

Fig. 4: is a front view with part of the casing removed. F 1g. 1s anenlarged detail sectlonal View snnllar to F 1g. 4.. Fig. 6 is asectional view from the left as on line M--N of Fig. 5. Fig.7 is asimilar sectional view as on line OP, and Fig. 8 is a similar sectonalview as on line XY of Fig. 5.

My device comprises an ordinary gas cook body A which fits the aspipe,and is continued from the gas coc lr seat in the form of a burner tube Bas shown. This tube may I5 a collar 15 and an adjusting screw 16, Iattach a thermostat rod 10, 11 the upperpart of which 10 is preferablyof brass and extends near but not into the flame F. The lower part 11 ispreferably of copper and runs downward to the brake wheel (35 to be hereafter described. The heat from the gas flame F heats the upper brass end10 of my thermostat and the heat is conducted therethrough to the copperend 11, thereby expanding or lengthening it. It expands more than burnertube B on account of being copper while tube B is steel or iron, and onaccount of lava tip 0 which insulates tube B.

The gas cook D carries a finger 12 and the adjoining side casing plate13 carries stop pins 14, 14; which permit the cock to turn only 90degrees. The cock D is of any usual type comprising a. thumb piece 20and a perforated stem 21 which passes into a tight seat in body A. It isso arranged that a quarter turn will make its valve passage 25 registerwith the passage 26 in body A and tube B thus allowing a full flow ofgas. This stem 21 of cock D extends entirely through body A and 'isformed with a circular recess 44 in its end to receive the reduced end45 of the spring spindle 40. Stem'21-near its end-adjoining recess 44carries preferably two winding pins 22, 22 adjacent tothe inner face ofwinding disk 30. This winding disk 30 is carried by the inner end ofspring spindle- 40. It may be fixed thereto by a key 34. i I r (In ,thepath of each winding pin 22, I

w nect thetops of each set of two disk pins 32 by a retaining plate 33which extends over.

insert in winding disk 30,- preferably two pins, 32 which I will calldisk pins. I conwinding pins, 22 and thus prevents cock D from beingpulled out of its seat.

One end of spring spindle 40 has a shoulder which rests against the end.of stem 21 and projects at 45 into recess 44 in the end thereof. Nearits other end it has a rim 46 which rests against the casing plate 41andv serves to hold main gear '50 in position.

j Spring spindle 40 at its outer end bears in l the casing 41 and isattached to one end of the main spring 42 The other end of main spring42 is attached to casing 41 at 43. It is evident that by turning cock Din the directionjof the arrow in Fig. 6, the winding pins 22 will engagedisk pins 32 and will winding disk 30, I loosely pivot the main gear '50to which is attached bya' key 47 or otherwise, a ratchet wheel 51. Tothe Wind ing disk 30 adjoining this'ratchet wheel, I attach a springpressed pawl 52 which en gages the ratchet 51. Thereby, when the gas isturned on and the main spring 42 tends to return the cock D to itsnormal position, it must also revolve theratchet 51 and main gear 50.This main gear 5 O connects with any suitable escapement devlce E whichwill prevent it from revolving rapidly and which 7 produces the resultof permitting the cock to be closed slowly. In the drawings,.I show thisconnection by the pinion 60, shaft 61,

and gear 62. The balance wheel 63 and hair spring 64 and the wholeescapementdevice E are of any well known construction.

Gear 62 carries a brake pulley 65 to which the lower end 11 of thethermostat extends;

It is apparent that asthe thermostat BX.

pands by the heat, it will bear against this pulley and stop the clockwork and the closing of the gas cock D. It is also apparent that the gascook D is free to be turned back after it is once turned on except forthe gradual closing by the mainispring. As

this closing is stopped by, the thermostat, the cock can be turned'b'ackand forth between pins 14 and 14 and the gas can be turned up or-downfreely. If, however, at

any time the flame is extinguished, the thermostat is retracted and theclock work operates to slowly shut off the gas.

I prefer to inclose burner tube B and the lower leg 11 of the thermostatin a burner casing 80. This casing rests on top of the casing 13, 41, 81for the clock work and fits around collar 15. It also preferablyterminates at the top in a flange 82 which extends above collar 15 andforms a cup which catches any soot which might be formed on the upperleg 10 of the thermostat and drop therefrom.

ment shafts.

. .80 I find it convenient to use a separate plate '83 to support theinner ends of the escape hat I claim as my invention and desire tocoverby Letters Patent, is: V, I

1. An automatic shut off device" for gas burners which comprises a cock,windlng pins carrled thereby, a main spring, a

spindle therefor, a winding disk carried'by the spindle, disk pinsthereonwhich engage the winding pins, a spring pressed pawl carried bythe winding dlsk, a main. gear loosely carried by said spindle, aratchet carried by the maingear in operative relation with said pawl, athermostat rod proximate the gas flame and extended downward,

and an escapement system operated by the main gear and comprising abrakepulley proximate the end of the thermostat.

2. In an automatic shut off device for gas, burners, a burner tube, acock seated therein, winding pins carried thereby, a spring spindle, acasing, a main spring attached to thespindle and to the casing,a.winding disk carried by the spindle, proximate the winding pins, diskpins carried by the disk in operative relation to the winding pins, a

retaining plate which connects said'pins, a spring pressed pawl carriedby the winding disk, a main gear loosely carried by said spindle, aratchet carried by thevmain gear in operative relation to said pawl, anda gear which engages the main gear and carries a brake pulley, combinedwith an escapement system operative by the brake gear, and a thermostatrod carried by the burner tube proximate the gas flame and extendedupward therefrom' and downward to said brake pulley.

3. An automatic shut off device for gas.

burners, which comprises a gas cock body, a cock seated therein, and aburner "tube formed of iron extended therefrom, combinedwith a mainspring, means connected wlth the gas cock for .WlIlCllIlg the mamspring, an escapement system connected with.

the main spring and comprising a brake pulley, and a thermostat rodearned at its 6 intermediate port-ion by the burner tube and comprisinga brass portion which extends upward proximate the gas flame and acopper portion which extends downward in operative relation with saidbrake pulley.

4. In an automatic shut off device for gas burners, the combination of aburner tube, an insulating tip therefor, a valve, mechanism foroperating the valve, and a thermostat rod aflixed near its middleportion to the burner tube and extending upward therefrom proximate thegas flame and downward in operative relation with the mechanism foroperating the valve, the said thermostat rod being composed below itspoint of support of a single material of greater expansibility by heatthan the burner tube.

5. In an automatic shut off device for gas burners the combination of aburner tube, an insulating tip therefor, a valve, mechanism foroperating the valve, a thermostat rod composed of a single material ofgreater expansibility by heat than the burner tube running fromproximate the gas flame to operative relation with the valve mechanism,and means for supporting the thermostat rod near its middle portion inadjustable relation with the burner tube.

In testimony whereof I hereto aflix my signature in presence of twowitnesses.

WILLIAM BRENNAN.

Witnesses:

FISHER H. PEARSON, GARDNER W. PEARSON.

